Cass Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Cass Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Cass Lake today is 21.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 2 | 18.2°C | 20.5°C | |
| JUN 3 | 18.2°C | 20.5°C | |
| JUN 4 | 18.6°C | 20.5°C | |
| JUN 5 | 19.6°C | 20.5°C | |
| JUN 6 | 20.4°C | 20.5°C | |
| JUN 7 | 21.1°C | 20.5°C | |
| JUN 8 | 20.9°C | 20.5°C | |
| JUN 10 | 20.5°C | 21.3°C | |
| JUN 11 | 20.5°C | 21.2°C | |
| JUN 12 | 20.5°C | 21.2°C | |
| JUN 13 | 20.5°C | 21.1°C | |
| JUN 14 | 20.5°C | 21.1°C | |
| JUN 15 | 20.5°C | 21.1°C | |
| JUN 16 | 20.5°C | 21.0°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 4°C | 7°C |
| February | 0°C | 4°C | 7°C |
| March | 1°C | 5°C | 8°C |
| April | 5°C | 10°C | 15°C |
| May | 9°C | 14°C | 20°C |
| June | 17°C | 21°C | 24°C |
| July | 21°C | 24°C | 27°C |
| August | 22°C | 25°C | 28°C |
| September | 18°C | 23°C | 27°C |
| October | 14°C | 17°C | 20°C |
| November | 6°C | 10°C | 14°C |
| December | 0°C | 3°C | 7°C |
Cass Lake: Water Temperature by Location
Cass Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Cass Lake in Michigan typically follows the seasonal patterns of mid-latitude inland lakes. In winter months the surface commonly sits at or just above freezing, around 32°F (0°C), and lakes are often ice-covered. During spring the surface temperature climbs from roughly 34–55°F (1–13°C) as snowmelt and cooling winds moderate warming. Summer highs are the warmest, with surface water most summers ranging roughly 68–80°F (20–27°C) and occasionally reaching low 80s°F (27–28°C) during heat waves. In autumn the lake cools again, with typical surface temperatures dropping into the 50–65°F range (10–18°C) before returning to freeze conditions.
Recreational swimming is commonly practiced at Cass Lake when conditions permit, but it is subject to local rules, beach facilities, water quality advisories, and natural hazards. Open-water swimming is safest in the warmest months when surface temperatures are comfortable; colder water under about 60°F (15.5°C) can be uncomfortable and increases risk of cold-water stress. In winter the ice makes open-water swimming unsafe except for controlled, supervised ice-swimming events with proper precautions. Occasional algae blooms or runoff can prompt temporary advisories, so swimmers should heed municipal postings and exercise standard water-safety precautions such as swimming with a companion and using life jackets when appropriate.